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A058439
Numbers k such that k^2 contains only digits {0,4,7}, not ending with zero.
1
2, 88, 638, 2010988315424552
OFFSET
1,1
CROSSREFS
Cf. A058440.
Sequence in context: A244386 A273520 A066226 * A058463 A364974 A166848
KEYWORD
nonn,base,hard,more
AUTHOR
Patrick De Geest, Nov 15 2000
STATUS
approved